CN201184354Y

CN201184354Y - Heterodont anti-loose and anti-drop nut

Info

Publication number: CN201184354Y
Application number: CNU200820085878XU
Authority: CN
Inventors: 张成钢
Original assignee: NINGBO YONGLING MACHINERY PARTS CO Ltd
Current assignee: NINGBO YONGLING MACHINERY PARTS CO Ltd
Priority date: 2008-04-16
Filing date: 2008-04-16
Publication date: 2009-01-21
Anticipated expiration: 2018-04-16

Abstract

The utility model discloses an anti-loosening and anti-drop nut with abnormally-shaped teeth, which comprises a nut body, and internal thread tooth-shaped bodies arranged in the inner cavity of the nut body at equal interval, wherein each internal thread tooth-shaped body in the nut body has a jacking surface and a withdrawing surface; a wedge-shaped bevel extends from the jacking surface to intersect with the withdrawing surface of the upper adjacent internal thread tooth-shaped body to form a thread groove matched with a screw or the outer screw thread of a bolt; an angle alpha equal to 22 DEG to 27 DEG is formed between the wedge-shaped bevel and the thread screwing direction of the nut body; and the direction of the wedge-shaped bevel is reverse to the thread screwing direction of the nut body. The anti-loosening and anti-drop nut can eliminate the radial gap between the teeth and greatly improve the helical friction force to better prevent loosening and falling when encountering various kinds of larger loads, thereby radically solving the anti-loosening and anti-drop problem of thread connection. Additionally, the anti-loosening and anti-drop bolt has simple manufacture, convenient use and no need for additional accessories.

Description

The locking screwed retaining ring of heterodont

Technical field

The utility model relates to the middle technical field of fastening of using that is threaded in the mechanical parts, the locking screwed retaining ring of particularly a kind of heterodont.

Background technique

In machinery assembling field; the assembling of very most parts such as machinery equipment and assembly is that the connection by threaded fastener realizes; but under the continuous effect of high vibration and all kinds of alternate loads; regular screw threads connect the phenomenon that can occur getting loose voluntarily usually; cause to connect and lost efficacy; thereby the security of operation to equipment and vehicle etc. causes a hidden trouble, even causes the accident.In order to solve this problem that gets loose of screw thread, people design a lot of ways.General employing increases lock washer, inlays trivial of nylon, wears check pin, colludes the phenomenon that gets loose voluntarily that screw thread is avoided in locking measures such as locking spring, abnormal screw thread and chemical gluing.Many shortcomings such as but all ubiquity such as the installation cost height, installing space is big, assembly technology is complicated in these locking measures, repeat usage is low and anti-loosing effect is not good.Therefore designing a kind of threaded fastener simple in structure, easy for installation and that anti-loosing effect is good becomes the difficult problem that the loosing Prevention Technology field presses for solution.A kind of preferably technology is that the patent No. is that the Chinese utility model patent " the locking screwed retaining ring of Full Thread FT " (notification number is CN2718303Y) of ZL200420084678.4 discloses the locking screwed retaining ring of a kind of Full Thread FT, it is provided with the inclined-plane at the thread form root of internal thread, outer end at nut body is provided with groove, be provided with catch in this groove outer, in described groove, be provided with the metal ring shell fragment.But because the existence of metal ring shell fragment is arranged, increased the difficulty of processing this type nut, cost is higher, and also must to dispose the metal ring elastic piece structure when making nut loaded down with trivial details, whole usability and obtain anti-loosing effect bigger reduction is all arranged.

Summary of the invention

Technical problem to be solved in the utility model is the present situation at prior art, provides a kind of making simple, safe and convenient to use, and more reasonable structure is simple, the locking screwed retaining ring of heterodont that can cooperate with normal screws and use repeatedly.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: the locking screwed retaining ring of heterodont, comprise nut body, the nut body inner chamber is shaped on the internal thread tooth form body that uniformly-spaced is provided with, each thread profile body all has the roof pressure face and moves back the flank of tooth in the nut body, the roof pressure face is extended with a wedge shape inclined-plane, and this wedge shape inclined-plane extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove of adaptive screw outside thread tooth; Wedge shape inclined-plane and the screw thread of nut body are screwed into direction and become α=22 ° to 27 ° angle, and the direction on this wedge shape inclined-plane and nut body screw thread to be screwed into direction opposite.

The measure of taking also comprises:

Above-mentioned roof pressure face and the angle that moves back between the flank of tooth are 60 degree.

The middle footpath of above-mentioned nut body is provided with bigger than footpath in the common standard nut according to the pitch structure, span is 0.1 millimeter to 1.0 millimeters.

Compared with prior art, each thread profile body all has the roof pressure face and moves back the flank of tooth in the nut body that the utility model adopts, the roof pressure face is extended with a wedge shape inclined-plane, and this wedge shape inclined-plane extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove of adaptive screw outside thread tooth; Wedge shape inclined-plane and the screw thread of nut body are screwed into direction and become α=22 ° to 27 ° angle, and the direction on this wedge shape inclined-plane and nut body screw thread to be screwed into direction opposite.When running into all kinds of bigger alternate load, owing to eliminated the radial clearance of between cog and increased helix frictional force greatly, can play good locking anticreep effect, from with this solved the locking anticreep problem that is threaded, and make simple, easy to use, need not increase annex in addition.

Description of drawings

Fig. 1 is the utility model embodiment's a schematic representation;

Fig. 2 is the practical application schematic representation of Fig. 1.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

To embodiment shown in Figure 2, figure grade illustrates as Fig. 1: nut body 1, and internal thread tooth form body 1a, roof pressure face 1b moves back flank of tooth 1c, wedge shape inclined-plane 1d, screw 2.

The locking screwed retaining ring of heterodont of the present utility model, comprise nut body 1, nut body 1 inner chamber is shaped on the internal thread tooth form body 1a that uniformly-spaced is provided with, each thread profile body 1a all has roof pressure face 1b and moves back flank of tooth 1c in the nut body 1, roof pressure face 1b is extended with a wedge shape inclined-plane 1d, and this wedge shape inclined-plane 1d extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove 1e of adaptive screw outside thread tooth; Wedge shape inclined-plane 1d and the screw thread of nut body 1 are screwed into direction and become α=22 ° to 27 ° angle, and the direction of this wedge shape inclined-plane 1d and nut body 1 screw thread to be screwed into direction opposite.Above-mentioned roof pressure face 1b and the angle that moves back between the flank of tooth 1c are 60 degree.The middle footpath of above-mentioned nut body 1 is provided with bigger than footpath in the common standard nut according to the pitch structure, span is 0.1 millimeter to 1.0 millimeters.

The application of present embodiment: after nut body 1 is screwed to the precalculated position and is subjected to certain prefastening torque, the screw 2 outside thread cusps that cooperate will withstand on the distinctive wedge shape of the nut body 1 internal thread inclined-plane tightly, the tooth top actual gap that makes nut body 1 internal and external threads is zero, thereby eliminated the tooth top radial clearance of nut body 1 internal and external threads fully, the locking of realization Full Thread FT, make fastening piece under the radial force effect, can not produce horizontal moving, simultaneously under the identical situation of axial force F z, the wedge shape inclined-plane produces than the big nearly 4 times normal pressure Fn of common standard screw thread to the screw 2 outside thread crests that cooperate, and the externally threaded cusp of the screw that makes cooperation produces the resiliently deformable of trace, thereby make also bearing load simultaneously of 60 ° of tooth form inclined-planes, increase the area of contact of helix, improved locking frictional force.

Most preferred embodiment of the present utility model is illustrated, and various variations or the remodeling made by those of ordinary skills can not break away from scope of the present utility model.

Claims

1, the locking screwed retaining ring of heterodont, comprise nut body (1), described nut body (1) inner chamber is shaped on the internal thread tooth form body (1a) that uniformly-spaced is provided with, it is characterized in that: each thread profile body (1a) all has roof pressure face (1b) and moves back the flank of tooth (1c) in the described nut body (1), described roof pressure face (1b) is extended with a wedge shape inclined-plane (1d), and this wedge shape inclined-plane (1d) extends and intersect with the flank of tooth that moves back that is positioned at the adjacent internal thread tooth form body in upper end, and constitutes the thread groove (1e) of adaptive screw outside thread tooth; Described wedge shape inclined-plane (1d) and the screw thread of described nut body (1) are screwed into direction and become α=22 ° to 27 ° angle, and the direction on this wedge shape inclined-plane (1d) and described nut body (1) screw thread to be screwed into direction opposite.

2, the locking screwed retaining ring of heterodont according to claim 1 is characterized in that: described roof pressure face (1b) and the angle that moves back between the flank of tooth (1c) are 60 degree.

3, the locking screwed retaining ring of heterodont according to claim 1 is characterized in that: the middle footpath of described nut body (1) is provided with bigger than footpath in the common standard nut according to the pitch structure, span is 0.1 millimeter to 1.0 millimeters.